The name combines JQuake, a reference to Japanese earthquake monitoring, with shindo, the seismic intensity scale used in Japan to measure shaking strength. Versions labelled 2 circulate on soundboards as a compact alternative to longer warning recordings, shared for edits where a full siren would be too much. Its popularity comes from instant recognition among viewers familiar with disaster alert memes, and from how easily the short clip can be looped, layered with screen shake effects, or timed to a punchline in gaming and reaction videos.